I used to have a Janspeed (full system) on a Sunny GTi-R, sounded amazing although it was vvv loud, even got the odd bit of flame on a couple of down changes. As for reliability I didnt have any problems whatsoever which is a hell of alot more than I can say for f*****g Devil - absloute complete bag of sh**e. Had a centre section and back box on my 172 (mk1) for about 18 months, centre section was replaced 3 times and the back box 4, in the end I got all my money back and got a Scorpion system which Ive had for about a year and so far so good (fingers crossed). Mates got a Mk2 172 and also unfortunately bought a Devil Back box, hes now on his fourth!! The Devil system on mine only sounded good when it was very warm, although admitedly it did sound rather nice then. As with most things though you pays your money and takes your chance as no doubt there are loads of people out there who havent had any probs with Devil.